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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f72783c9855377c7bd484ce42fa16034967cc8638510d5e80fa1cfddf272ef7' 
  AND token = 'f3vbr3pnVNsje6PCOGFv8GaSfRdba8Y59y/p/Ao6llg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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