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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c1669c7e30929d9f8cef39763c7b3e8e074949deeae8d12230caccf2d5a31f' 
  AND token = 'Qcr5ppgP83PLwIenngSJPTV/8WchPzY/S4jybtEuChs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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