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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6113849b35edb5b959c33f08be97670927e4a7e720fd9a1062a99934076e0ad5' 
  AND token = 'J8mu0ZJJwctjixZb2T2VmPxEMS7Qm/MOWQItYSK/VtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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