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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50971f2868f05452922bc59c6aaa7a49a329ef654d54f85036a86e3881346081' 
  AND token = 'mWiHhIGjy7wZ0E6Cq473GG32zahl2latAh+/VU0UOFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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