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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f037e237499c362a1149bc87906d4ce67f2288380e7e9194c1ff740c243dfcf2' 
  AND token = 'jUs+g+QqRv1WA4AljS4Gbe6GKQKO65vZKxel0lNzGvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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