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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913bfd50be89b58b9d03e522b7a9244d6b99061e74ff3433ed77b993a402a993' 
  AND token = 'q+DGW+d+ycKw76kbT9fORDGmkQbleAxKwDn5Iu9YlOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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