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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e2e28aa93f7be902938953bfb0e6565b4bd881d4ad39ce2cbe3c59a5d1d8c2' 
  AND token = 'qI8sYZNS4dzBGrIKVM5YIO9Fb0512R0+QNpi+sebHLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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