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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7548f7f7c3fb2573d8a9fc11cf6c05ae6c5e5f24862e773f3c9e7a8653bf3143' 
  AND token = 'BgdWqzBXG2UEn5y30ilqFGVDLvnp/dpZ4Bo0otrmPr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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