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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2f807811a0571c7742c5ef1494e5956342f12a3cbfa688dd941a3dc90518fa' 
  AND token = 'Og9ilqzOedB/7NRR73KG+Ao/C7IB5EXD6DvWhA9uuas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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