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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c76a142a3759a7e76efc3a38cee895e8edff550295fbdb8dfb9e529e68bc762' 
  AND token = 'pPfiVWi8C4D0tG+yIO+YGmRNSUm6T8x0OM73PYJbu0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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