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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b612aaea9b277801ebaba7e06ce07f2c02f8c0f0b1f14fc7fe53d8ba30c907b' 
  AND token = 'Fd5VN4k6UVuWkxb7Abr0TOHoOIxjj2QBwQ1dG7ejopw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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