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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631c2131b406f9daf85d1933565fd887bad3a86bd6192e3d275829060aea5172' 
  AND token = 'JSPcOnHtu4shad7uxYs2g/l38Os4wRopyIj/M0uPi/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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