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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e2af12f35d765d5f8aa7726060fc1f402a5cd28cdd58b499cb8651c103f86b' 
  AND token = '3A0EyJQHrgydXiqfR+aaz127tNwtfs+hzPHFp6jocPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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