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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47a333ef2a5927460e652af5ee42c3e3e9c5cacfabf2a2fb3b7e4e8468ae305' 
  AND token = 'QdWBOPCP/ntvsMMVzeKDHHlN1RYh8gn1ty56hQpozX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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