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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c814425e0343523dc72447950f576cd59855d01fb21313433e949d3698b2954' 
  AND token = 'MKKSxlS3q7foCfH+Z+MTSkCxqEEB4VeUF9JESBL/hMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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