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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624c2518c45bbc06d4cc6d054cc53ac29d23cc89b40398f297f73822395388b2' 
  AND token = '5883MXzd4DMBMZhg8gNuahd/9wAtQ3aMv3gjoGJeIKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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