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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c136e69ff1d1ea8889267eb3945e1d12da09f173f99bd3cd0d6c03c5f5cd34c2' 
  AND token = 'Ze/NbiKDcuY/FK6V5g2LfOIQ075NfDjFpZUU0e1K0Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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