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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64590bf97b66991b0c0fa2d0193840bf478365b2561c95316f238aca58191b5e' 
  AND token = '/CThX3t8knYHWd74YyZONq2HfJ2/aGfDarCL4JHOjR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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