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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db38931843235fa7b409a3b7b7d9827cb0df90d793e476767d6e0bedd41c4f6' 
  AND token = 'oZ7RO1yr4BXgyO4+KvOlnwPzTV3Zj8TLdHtz6uwI0vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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