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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db2fab96d1af82170435bf4eb944bef32e38c87b0fdaf0bc5daca4b05d96e4d' 
  AND token = 'in8YWjQAJCVd856qbADPzOzCB8Hi/A9OddO/f5XVteI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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