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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e186ae9b73f2cc93fd7723f383601176143d2c5fbbfd79c46376aa74c8b009c' 
  AND token = 'slRk00dbXbYOApx60CC4GDCjgl0gk/r7CxjoEqwjJis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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