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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c257aaa01c7073331a1285e33d0b24ba357d95fcd5b15c5bafc5a68f4c2175' 
  AND token = 'Z8Ls8Qg5bvzeFPfRyMSVw+SvB+h35OBiKFPNwpigXfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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