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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09695efae688d259ad636223953cbd9afc232ca4665e9270c5182b73f6a2183f' 
  AND token = '8X64KreNpM3EO9/1FQjEueDTi3zp27KjCmHE5bYkBPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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