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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5c915c5104febcf5db410946b3258300ba5861326aa1ce31411de05e9e98f0' 
  AND token = 'bRb3Yzx+Ti4i0xfRPQKWe0G54uS1zaLVu4YvuK5ll88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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