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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb252a6aa00b8fcaf4f409b4b6a82e8460c71c1f929bf178328ad9007db630c1' 
  AND token = 'EoIjm3KJvnXKrAk/trJ7LWCdIs47Q1BRfeWAp6eO6K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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