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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad01d232b2dc9b17b61170e25c57a65472aa0d7b19bd5125efe2ea960b92283' 
  AND token = '7TeFShXeidstx3kfKBHoVLJkxgIC1YbnwvHToVZ/V1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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