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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a0543c3bc4ad6318446d92109f8ef16814ba473676cdc22e0b2ef66ee0cd7c' 
  AND token = 'yiAIuD4cevQb7XjCpLknbt0i/7t0IxA7ELus+HerO10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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