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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882b35333b178d295453d6b878e2c5a34eeb802db2fcfc3798c52f42c11b941e' 
  AND token = 'qXbGEKchrogHSSxsybXBa9qFkWlD59+XogEEQ/tps28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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