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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb0129032610a5ea49967686ef280aaf23cc7cf3dea34ff4bf0f0fa33dc9ce9' 
  AND token = '/e6QlCtGuBWmI6XI5BgjwdYD7QhLWI4WDQkqWA5Ur2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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