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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bc522b50941e1d5feb386fbf0ad5f282b6df5179b8d3186f443f4551d4284e' 
  AND token = 'xi0L3ccfWTdjd5klDs3yTWj81rlgK6ZAXCgTStst+Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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