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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcb10df19429dae3a0608944071d271d4377cbd9558fc223dbd72325cb6c1f3' 
  AND token = 'OVHqW1bKcD0fmb8nM152P3mkTb6jzZTuFl3Rbjc1RGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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