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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dfc73f168e4ae1065ae72c1f5658ea1a61ba604315aea4d26902410974d93c' 
  AND token = '5t8IjPvdikeEPuuBAC973KqkcAqEnH6RfIaW3yXW38c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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