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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac88c4b451d632d09b3a97588cefd3b585fc1f5a9eea202d0e57c36931891bf' 
  AND token = 'oJ6D4l7q/2tIGcNIzYMIyr9z3gBShTmz2pgaza10Has=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}