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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb5433a4e3aa9e55fbdf91267839478ca0f66f879bfaf5fbe4b1ecf7e250543' 
  AND token = '0oQSlah+oCYM0hEV0ID5FBi2FWSx9AnMdb0E1iWaxkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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