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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab235973e613450c8e8d0f0a0432330903035418c897b9c2aff978dbf4ac0fb9' 
  AND token = '6VoilUNBaM1s3gfDV31AE+kvTLkYN+NNBQyZvmwQ1aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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