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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ac79cc1c4c78ce9b4c3901a57cc4f5eada4b77f6dd5e0cb43b40fb1b3f28ce' 
  AND token = 'KmtYaDpI/H+KaPHpN9GmxSEHUlaMmzmmZquBg0TKcmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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