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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23e42e166dccc3a0f842d8dee8a5f6970becffd8f4a45305c2f9bacdc9a7c3c' 
  AND token = 'T6i5Nrd7/Jqk8dXv7YR988pCyRbqmiqmNzrFiUM72FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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