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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bfe0a7baf1bfe1215b34aaa2e9a0cd2e68092cecf53105a86771b238caf917' 
  AND token = 'uK/kmYl5WDsVZDZp7B8dWaam0hy6eo2xYcAuVyIi6Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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