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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552b47cf94a5f38e73bb64e6840a8a85cd982be57779acf584276877d209f78a' 
  AND token = '5028zROBXXNiY8d2TBlecLb4/41XHzYYJQJq7XPZXnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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