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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1769437dfaf60bc7035e04acfd7bbcf6de1c8fcaa46cd5e1f4640711aeb788f0' 
  AND token = 'GMMVI0MowuD83LUfEq1RbJX+c2WgGYTcnsfGqFj31/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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