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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6bb2156d5606deb4a76c30db45a7a1a5958dbfe8b7345ad46c220ebf2c1ebb' 
  AND token = 'tXA+GUkwJyr/F6DPBCzM+5sluByxFQ5fA2vW0wQeOxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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