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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5328eb0f75b29bd52f79d8dfc19a0944daef857c47352a2ff61e1b2dec1214c5' 
  AND token = 'dVf7sF2uEXflQOzULTCpBTd8Wxv+MW/zt6PHWe1drnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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