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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dc90d3d1a0b52990716dd8609d7b4a3e46b8caae91c59b75a7d9ebc1ae6fd6' 
  AND token = '5Ae1rGQt6NA8MP+fxViTP+qjDZwvHyHeAhHHGGknRsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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