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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a2ed0bc908ea07aa565ecc17b7c4d8f7eb396040e71abd11fd439d3e6c3c1f' 
  AND token = 'Bxt87ytpmHsokPFSeJQIg9130msbvtVssqgRaLHHKpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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