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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116e719b8f1d7b3ebf06840985f85adc8ea2768df817f11fcae8271843eec30e' 
  AND token = 'jfgQ3tzKdem/Ngzl3cZgsDW/E/nmppaxS4dK4GEvbLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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