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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e34f3a90efa5194c14a08217cd2eedf08acc23e3978301f4b030252ef40921' 
  AND token = '1knhJK8vzgg3ngM4o0gag0RmB8SOg9DmksqxR1T3tPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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