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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6069fb77525a16553b6d3f071b04f5f48cdd710caa56ca3b9b6f09e5f3b2c5' 
  AND token = 'dDjliwK179VNy8MBRxVYYwTndMiuGZjfxXrQm2MmMTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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