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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd862fec68b7458b64a9a6e4ce4c881e2cc21a2a3c363b408a32c6ed3e1caaa6' 
  AND token = 'Y4UXABMTYwChgBB9D0cgRFhPm4GzRQ8py4aJmLiCc/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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