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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decb895b25dab2be3e93ac40108d35fa50dc7dba7e933133ebbfe909c45d953d' 
  AND token = 'ka809R8foYwEqItp51xR0ykxOShd5iTq0m+wa/vBGrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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