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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac21a1e36d58c4cab6161fbea737451ce54e6c9952059357b6204ad281b51175' 
  AND token = 'axoKANYH0szBNUaKZdu9Fjtn0ikjBLrx2wHRGV02Z1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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