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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f2d0474f8b55a6bbfe6a2f6e424ad58a53b6b0514c9d1fca8871af8b73d9a4' 
  AND token = 'ChGKsSEtrQet8BZfH9voIZtWE1X3iOnZE0Nzm8WHmQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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