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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a1a317b841f6b874180de82b0636c12acfd6c496f4a49566e69e5b0b4e1e45' 
  AND token = 'GX+Jm6bcHcwfO1X3NwG7CMqZiSH8T7ETOoxbwCYxn/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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