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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfddf37e241b074f92ae581eb2953bb424962aa258c7392229f502d22d1ea7a7' 
  AND token = 'Mklp2oDVSUuvUy4io9uWXZVHiY0VyxHZlIC9Widbm8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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