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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54428ed7b758c60b71208243755dcf6296b4ff582d790c787815c0f6dcf64a77' 
  AND token = 'dCMo4tjAzOH+qv4nLPy4CGlI4+dCpwWGrAN7EpY+JI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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