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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9110124547c794c46b200f037ab93b00d1698262c88be31426d70d12219e3a' 
  AND token = 'tM/RMOf03vYMmvg+JOckAsg4cjI4Gt8IBbirFxxykJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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