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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85060689a27fe2e072b22db366bbf39f3f2453de67244522aa787f88295b0484' 
  AND token = 'Y5xj6EHPu3jx3OPqV12mDcVeWeBI0R1au2/cTjGuTgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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