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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bd8f0fadd3fb0d47c3b87b37c590249765c6b0a0ac5bc995968f84d05293d6' 
  AND token = 'y7C67NRcup9mthf3q3IVY0veA4vySx58EuPMe1Evmao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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