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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373971eb32ecc9e0a38d1c83c581b33b0b31599f9ede6a1cbfffc0534e71c275' 
  AND token = '3eudjGzsztJYkOehjX3wLPVnDV+K9XSo4JP/Wc3fu2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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