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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb9ea21f6587c9f7af83815e0dd140dbf52fdafbb081c1a90844b5aa13f6dc5' 
  AND token = 'eDVseOSoDrw6y037zwNX/XSy2TdYcdFC2crlv6s2ywg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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