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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6b58beddab6b1b68b117d85bc8ca89cf7e87fd6a891718268ae5c5a569747e' 
  AND token = 'w4NJDa79heyMn/qBEIIXmpwl5ptlCsFq+GoIFkHvOZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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